Revealing mistake: When the Doctor and Jo see Bessie in the middle of the rocky area, there is the white chalky substance from the ground on her wheels, indicating she was driven to the spot rather than being "transported" to the black-hole.

Plot hole: The Brigadier says UNIT HQ is 'a Top Secret establishment'. It is, in fact so secret that it has a large sign outside informing the world not only of its function, but also the name of the commanding officer...

Plot hole: Yartek tried to disguise himself as Arbitan, by wearing Aribtan's robes, and pulling the hood over his giant rubber head. Strangely enough, no-one seems to notice that "Arbitan" is now suddenly speaking with completely different voice, and now has a two-foot-tall-head.

Revealing mistake: Susan is supposed to be running through a forest. It is painfully obvious that, in fact, she is simply running on the spot against a back-projected film, and the branches that hit her are simply studio stagehands, hiding just out of shot, hitting the actress with twigs.

Other mistake: William has a bit of a nightmare, completely throwing the others during one scene by saying the same line ("It's not very likely") twice, and fumbling the line "You knocked both Susan and I unconscious". He also omits the scripted explanation for the melted clocks.

Continuity mistake: The caption slide at the end of episode two reads: 'Next Episode: The Cave of Five Hundred Eyes'. While the title slide comes up at the start of episode 3, it simply says "Five Hundred Eyes".

Factual error: The events depicted are supposed to have taken place at the time of the broadcast of the first Doctor Who Story...Saturday 23rd November 1963 at 5:15pm. However, the non-wintry weather and the bright evenings don't fit late November/early December.

Plot hole: The Tyrannosaurus Rex which appears in this story does not actually roar; instead it says the WORD 'roar' several times. There may be little scientific evidence as what sound a T.Rex makes, but it is unlikely that any of them spoke fluent English...

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Sylvester McCoy was given a new costume for Season Twenty-Six, with a darker jacket, hatband, tie and handkerchief to reflect the gradual development of the Seventh Doctor's personality, and to show that The Doctor himself was getting 'darker' and more serious. To surprise viewers with the revised outfit, it was decided the Doctor would begin the season 26 wearing a duffel coat over his regular clothes, the belief at this time being that The Curse Of Fenric would be the 'lead story' for season 26. Later however, it was pushed back to third in transmission order, meaning that the effect went for nought, as the costume had already been seen in the first two serials.